| Mcsewer Limited | Birkenhead | 2018 |
| Mcveigh Transport Ltd | Hillsborough | 2021 |
| Mcwilliam-Watkinson Limited | | 1972 |
| MD Asbestos Solutions Ltd | Fleet | 2020 |
| MD Clearances Ltd | Letchworth Garden City | 2026 |
| MD Compliance Services Limited | Stafford | 2015 |
| MD Environmental Ltd | Basildon | 2024 |
| MD Transport Services (London) Limited | London | 2018 |
| MD Waste Management Ltd | Stockport | 2020 |
| MD Waste Removal Services Ltd | Newport | 2022 |
| MD Waste Rubbish Ltd | Ilford | 2024 |
| MD1 Clearance Ltd | Rushden | 2023 |
| MDC Team Ltd | Oldham | 2025 |
| MDF Recovery Limited | Beaumaris | 2009 |
| Mdfr Natural Fibres Ltd | Beaumaris | 2011 |
| MDH Recycling Ltd | Southport | 2022 |
| MDK Enterprises Limited | Helensburgh | 2025 |
| MDS Recycling Limited | London | 2010 |
| MDW Contractors Limited | Hitchin | 2014 |
| ME Environmental Limited | Mansfield | 2019 |
| Meadow PIT Plant Hire Limited | Wigan | 2003 |
| Meadow Waste Ltd | Hull | 2018 |
| Meadowhall Landfill Limited | Parkgate | 1987 |
| Meadows Site Services Limited | Lochgelly | 2020 |
| Meakin Mover's Ltd | Cannock | 2023 |
| Mechanical Cleansing Services Limited | Barnet | 1997 |
| Mecore Limited | Cambridge | 2016 |
| Medcalfe & Co. (1950) Limited | London | 1950 |
| Medclear Limited | East Grinstead | 2021 |
| Meddings & Co Limited | Worcester | 2000 |
| Medellin Auto Services & Repairs Limited | Willenhall | 2024 |
| Medi Burn Ltd | London | 2023 |
| Medi Flame Ltd | Romford | 2025 |
| Medical AID and Textile Recycling for Africa Cause | London | 2024 |
| Medical Supply Management Ltd | Nottingham | 2023 |
| Medical Waste Ltd | Loughton | 2025 |
| Medical Waste Solutions Limited | Chelmsford | 2024 |
| Medipower Limited | Newhaven | 2017 |
| Medisort Limited | Bristol | 2009 |
| Medtranz Limited | Nottingham | 2007 |
| Medway Clearance Services Ltd. | Rochester | 2014 |
| Medway Home & Garden Improvement Ltd | London | 2025 |
| Medway Skip Hire Limited | Isle Of Grain | 2005 |
| Meehan Drilling Limited | Market Rasen | 2015 |
| Meekins Maintenance Limited | Wigan | 2021 |
| Meekins Skip Hire Limited | Hindley | 2026 |
| Mega Grab Ltd | Bromsgrove | 2021 |
| Mega Metals Ltd | Stafford | 2019 |
| Mega Skips Limited | Neath | 2024 |
| Mega Sweeps Ltd | Birmingham | 2026 |
| Mega Waste Recycling Service Ltd | Crawley | 2023 |
| Mega Waste Removal Limited | Sheffield | 2023 |
| Megoo Skip & TIP Ltd | London | 2025 |
| MEI Pump Services Ltd | Malton | 2013 |
| Meica Engineering Services Limited | Belvedere | 2024 |
| Mein Cleaning Services Ltd | Smethwick | 2025 |
| MEL Environmental Solutions Limited | Harrogate | 2011 |
| Melksham Recycling & Skips Ltd | Chippenham | 2023 |
| Mellands Skips Limited | Whaley Bridge | 2015 |
| Melmerby Water Trust Limited | Leyburn | 2004 |
| Melodyrecyclingservices Ltd | Birmingham | 2026 |
| Melrose Polymers Holdings Limited | Leicester | 2020 |
| Melrose Polymers Limited | Leicester | 2020 |
| Melsons Waste Management Ltd | Rugby | 2025 |
| Melton Mowbray Tyre Recycling Limited | Melton Mowbray | 2009 |
| Melton Tankers Limited | Grammar School Street | 1985 |
| Melton Waste & Recycling Ltd | Nottingham | 2009 |
| Melville C.W. Limited | Leeds | 1946 |
| MEN With Vanz Ltd | Belfast | 2019 |
| Mende's Ventures Ltd | Peterborough | 2019 |
| Mendip Toilet Hire Limited | Bristol | 2011 |
| Meopham Mini Skips Ltd | Ramsgate | 2021 |
| Meplas (Spilsby) Ltd | Spilsby | 2022 |
| Meplas Ltd | York | 2018 |
| Mercia Metals Limited | Warwick | 1996 |
| Mercian Recycling Limited | Oldbury | 2003 |
| Mercian Skip Hire Midlands Ltd | Oldbury | 2011 |
| Mercury Recycling Limited | Leyland | 1994 |
| Mercury Waste UK Ltd | Southampton | 2025 |
| Merics Limited | London | 2017 |
| Meridian House Clearance & Estates Ltd | London | 2026 |
| Meridian Recycling Ltd | London | 2023 |
| Meridian Technical Services Limited | Erith | 1994 |
| Merit Recycling Ltd | Nottingham | 2025 |
| Merkland Tank Limited | Glasgow | 2005 |
| Merlin Earth Movers Limited | Southam | 2025 |
| Merlin Environmental Services Ltd | Lydney | 2021 |
| Merlin Trading (West Midlands) Limited | Sutton Coldfield | 2016 |
| Mermaid Yard Clearance Limited | Henley-On-Thames | 2019 |
| Merriman Limited | Cossington | 1964 |
| Merryhill Envirotec Limited | Southampton | 1992 |
| Mersey Bioenergy Holdings Limited | London | 2014 |
| Mersey Move IT Ltd | Liverpool | 2026 |
| Mersey Valley Land Recovery Limited | Runcorn | 2013 |
| Mersey Waste (NW) Limited | Wallasey | 2018 |
| Merseymovers Ltd | Liverpool | 2025 |
| Merseyside Drainage Solutions Ltd | Liverpool | 2020 |
| Merseyside Energy Recovery Ltd | Maidenhead | 2012 |
| Merseyside Salvage Ltd | Bootle | 2024 |
| Merthyr Borough Recycling Centre Limited | Gwent | 2004 |